eV-scale sterile neutrinos from an extra dimension
Shinsuke Kawai, Nobuchika Okada

TL;DR
This paper proposes a model where eV-scale sterile neutrinos arise naturally from a warped extra dimension framework, explaining observed anomalies through a seesaw mechanism with hierarchical neutrino masses.
Contribution
It introduces a novel implementation of the seesaw mechanism in warped extra dimensions to generate eV-scale sterile neutrinos with natural mass hierarchies.
Findings
Hierarchies explained by fluctuations in 5D fermion masses
Seesaw mechanism adapted for extra-dimensional setup
Consistent with short-baseline neutrino anomalies
Abstract
Motivated by the short-baseline neutrino oscillation anomalies that suggest the existence of sterile neutrinos at the eV scale, we construct a scenario of a seesaw mechanism for 3+1 light neutrinos implemented by warped compactification of an extra dimension. As the seesaw mechanism necessitates at least two right-handed neutrinos at mass scales much larger than eV, incorporating an eV-scale sterile neutrino into a seesaw entails large mass hierarchies among the singlet neutrinos. We show that such hierarchies can be naturally explained by moderate fluctuations of the five-dimensional fermion mass parameters.
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